List of info sites and flash software (for any newbies reading this thread)
Super - free software for converting video to flash
http://www.erightsoft.com/SUPER.html
Creating Streaming Videos - simple tutorial about embedding vids
http://www.free-video-hosting.net/creating-videos.php
Jeroen Wijering - blog of a guy with useful flash tutorials and scripts
http://www.jeroenwijering.com/?item=Embedding_Flash
Flash Video Tools - conversion software, more expensive
http://www.flash-video-mx.com/
Easy FLV - as mentioned above, cheaper
http://www.easyflv.com/
Another page on video encoding
http://www.mediacollege.com/adobe/flash/video/encoders/
After doing a bit of research I've found this tool for testing the security of Flash. It's free under the GNU license
https://www.owasp.org/index.php/Category:SWFIntruder
http://code.google.com/p/swfintruder/